9th Physics Chapter3 Dynamics
| Sr # | Questions | A | B | C | D |
|---|---|---|---|---|---|
| 1 | If the mass of an object remains constant and the net force applied to it doubles, what happens to its acceleration? | It doubles | It halves | It remains the same | It quadruples | 2 | Which of the following is a vector quantity? | Mass | Speed | Force | Temperature | 3 | Newton,s first law of motion is valid only in the absence of : | force | net force | friction | momentum | 4 | which of the following is the unit of momentum? | Nm | Kgms^-2 | Ns | Ns^-1 | 5 | The tendency of an object to resist a change in its state of motion is known as: | Inertia | Momentum | Velocity | Acceleration | 6 | Which of the following material lowers friction when pushed between metal plates? | water | fine marble powder | air | oil | 7 | According to Newton’s second law, the acceleration of an object is directly proportional to the net force applied and inversely proportional to its: | Mass | Velocity | Volume | Density | 8 | What is the SI unit of force? | Joule | Newton | Watt | Kilogram | 9 | Which of the following is a contact force? | Magnetic force | Gravitational force | Tension in a rope | Electric force | 10 | If the net force on an object is zero, it will have: | Constant acceleration | No acceleration | Increasing acceleration | Decreasing acceleration | 11 | The weight of an object is a measure of its: | Mass | Volume | Density | Acceleration | 12 | According to Newton’s first law of motion, an object at rest tends to stay at rest unless acted upon by: | Gravitational force | Frictional force | Magnetic force | Electrical force |